Using Event-B for Critical Device Software Systems

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Introduction to Event Log Mining with R

Formal methods have emerged as an alternative approach to ensuring the quality and correctness of the high confidence critical systems, overcoming limitations of the traditional validation techniques such as simulation and testing. This chapter presents a methodology for developing critical systems from requirement analysis to automatic code generation with standard safety assessment approach. This methodology combines the refinement approach with various tools including verification tool, model checker tool, real-time animator and finally, produces the source code into many languages using automatic code generation tools.

This approach is intended to contribute to further the use of formal techniques for developing the critical systems with high integrity and to verify the complex properties, which help to discover potential problems. According to the development life-cycle of a critical system, first of all we emphasise on requirements traceability using a real-time animator. Formal modelling of requirements is a challenging task, which is used to reasoning in earlier phases of the system development and to make sure that the completeness, consistency, and automated verification of the requirements.

This is an initial step in the proposed development methodology of the critical system development.

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The real-time animation of a formal model has been recognised to be a promising approach to support the process of validation of requirements specification. It is crucial to get an approval and feedback when domain experts have a lack of knowledge of any specification language, to avoid the cost of changing a specification at the later stage of development. This chapter introduces a new architecture, together with a direct and an efficient method of using real-time data set, in a formal model without generating the source code in any target language.

This is a phase for validating a system through domain experts in our development life-cycle methodology. The principle is to simulate the desired behaviours of a given system using formal models in the real-time environment and to visualise the simulation in some form appealing to stakeholders. The real-time environment assists in the construction, clarification, validation and visualisation of a formal specification.

Refinement techniques serve as a key role for modelling a complex system in an incremental way. This chapter also presents a required technique namely refinement chart for handling the complexity of a system. Refinement chart is a graphical representation of a complex system using layering approach, where functional blocks are divided into multiple simpler blocks in a new refinement level, without changing the original behaviour of the system.

The main objective of this refinement chart is to model the whole system using graphical notations and to obtain a concrete specification.

Using Event-B for Critical Device Software Systems

This approach also gives a clear view about the system assembling based on operating modes and different kinds of features. To show the effectiveness of this approach, we have used this graphical modelling technique to simplifying the complexity of a system in the development of our selected case study: cardiac pacemaker. The most important step in the software-development life-cycle is the code implementation. This tool is a collection of plug-ins, which are used for translating the Event-B formal specifications into multiple programming languages.

The translation tool is rigorously developed with safety properties preservation. This is an essential tool, which supports code implementation phase of our proposed development life-cycle methodology for developing the critical systems. A closed-loop model of a system is considered as a de facto standard in the area of system engineering for validating a system model. Cardiac pacemakers and implantable cardioverter-defibrillators ICDs are the most critical of these medical devices, requiring closed-loop modelling integrated system and environment modelling for verification purposes before obtaining a certificate from the certification bodies.

This chapter presents a methodology for modelling a biological system, such as the heart, to enable modelling in a biological environment. The heart model is based mainly on electrocardiography analysis, which models the heart system at the cellular level. Roger Lee. Jan L. Multimodal Retrieval in the Medical Domain.


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Using Event-B for Critical Device Software Systems

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